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3 years ago

Please answer need help for a quiz

Mathematics

1 answer:

Paul [167]3 years ago

4 0

Answer:

option B

Step-by-step explanation:

$3i( - 4 + 2i)$

$= > 3i \times ( - 4) + 3i \times 2i$

$= > - 12i + 6 {i}^{2}$

But it's given that ${i}^{2} = - 1$

So,

$- 12i + 6 {i}^{2} = - 12i + 6 \times ( - 1) \\ \: \: \: \: \: \: \: \: \: = - 12i - 6$

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12 is 90% of what number?<br><br><br> with steps

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Answer:

<h3><u>Let's</u><u> </u><u>understand the concept</u><u>:</u><u>-</u></h3>

Here 12 is 90% of a number.
So we can say that 90% of That number is 12 .
In this way we can get the the number

<h3><u>Solution</u><u>:</u><u>-</u></h3>

Let,

the number=x

<h3>According to the question ,</h3>

${:}\longrightarrow$ $\sf 90\% \:of \;x=12$

We know 90%=90/100
so add it

${:}\longrightarrow$ $\sf {\dfrac {90}{100}}\times x=12$

${:}\longrightarrow$ $\sf {\dfrac {90x}{100}}=12$

Now use cross multiplication method

${:}\longrightarrow$ $\sf 90x=12\times 100$

${:}\longrightarrow$ $\sf 90x=1200$

Now interchange sides .

${:}\longrightarrow$ $\sf x={\dfrac {1200}{90}}$

${:}\longrightarrow$ $\sf x={\dfrac {200}{15}}$

Answer will come in decimals so we take approximate value.

${:}\longrightarrow$ $\sf x=13.3$

${:}\longrightarrow$ $\sf x=approximately \:13$

$\therefore$ The number is 13.

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